Merge r507526 from trunk:

Return METHOD_NOT_ALLOWED, not FORBIDDEN, to a TRACE request when
TraceEnable is Off.  This agrees with our documentation, and with
our Allow: header in response to OPTIONS.

Submitted by: niq
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@576514 13f79535-47bb-0310-9956-ffa450edef68